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Re: [Qemu-devel] [PATCH 0/2] use blk_pwrite_zeroes for each zero cluster
From: |
858585 jemmy |
Subject: |
Re: [Qemu-devel] [PATCH 0/2] use blk_pwrite_zeroes for each zero cluster |
Date: |
Fri, 7 Apr 2017 13:22:31 +0800 |
the test result for this patch:
the migration command :
virsh migrate --live 165cf436-312f-47e7-90f2-f8aa63f34893
--copy-storage-all qemu+ssh://10.59.163.38/system
the qemu-img info on source host:
qemu-img info
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
image:
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
file format: qcow2
virtual size: 1.0T (1095216660480 bytes)
disk size: 1.5G (1638989824 bytes)
cluster_size: 65536
backing file: /baseimage/img2016042213665396/img2016042213665396.qcow2
the qemu-img info on dest host(before apply patch):
qemu-img info
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
image:
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
file format: qcow2
virtual size: 40G (42949672960 bytes)
disk size: 4.1G (4423286784 bytes)
cluster_size: 65536
backing file: /baseimage/img2016042213665396/img2016042213665396.qcow2
the qemu-img info on dest host(after apply patch):
qemu-img info
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
image:
/instanceimage/165cf436-312f-47e7-90f2-f8aa63f34893/165cf436-312f-47e7-90f2-f8aa63f34893_vda.qcow2
file format: qcow2
virtual size: 40G (42949672960 bytes)
disk size: 2.3G (2496200704 bytes)
cluster_size: 65536
backing file: /baseimage/img2016042213665396/img2016042213665396.qcow2
the disk size reduce from 4.1G to 2.3G.
On Thu, Apr 6, 2017 at 9:15 PM, <address@hidden> wrote:
> From: Lidong Chen <address@hidden>
>
> BLOCK_SIZE is (1 << 20), qcow2 cluster size is 65536 by default,
> this maybe cause the qcow2 file size is bigger after migration.
> This patch check each cluster, use blk_pwrite_zeroes for each
> zero cluster.
>
> Lidong Chen (2):
> block: make bdrv_get_cluster_size public
> migration/block: use blk_pwrite_zeroes for each zero cluster
>
> block/io.c | 2 +-
> include/block/block.h | 1 +
> migration/block.c | 34 ++++++++++++++++++++++++++++++++--
> 3 files changed, 34 insertions(+), 3 deletions(-)
>
> --
> 1.8.3.1
>